when they start to change color[for copper jacketed] or if they start to seat back in the case from constant loading and unloading. ammo that sets back in the case[so it is shorter overall that the other rounds in the mag] can dangerously raise chamber pressure.so i would say the round you load all the time needs to be constantly checked. if it starts to sink into the case then throw it out. i try a maximum of 6 months. i usually buy my bulk ammo a couple times a year so i will buy new sxt or hydra shock and then shoot up the old stuff at the next range session. THE IMPORTIANT THING TO WATCH FOR IS THE BULLET SINKING INTO THE CASE THIS WILL RAISE PRESSURE TO POSSIBLE CATATROPHIC LEVELS
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